Anesthesia is the medical term for drugs that are used before, during, or during surgery to ensure that the patient does not feel pain during the procedure. In some cases, the drug makes the patient feel like they are asleep and when they wake up from the anesthesia, they won't remember what happened.

Anesthesia is the use of anesthetic drugs to put into the patient's body, either through inhalation or intravenous, leading to a reversible state of anesthesia. Patients can breathe on their own or with active controlled breathing during anesthesia.

Anesthetics are chemicals that, when introduced into the body in a certain dose, temporarily cause the patient to lose consciousness but still maintain vital functions. Currently, there are two types of anesthetics used to anesthetize patients: inhalational anesthetics and intravenous anesthetics.

Nowadays, with the development of medicine, patients can undergo painless procedures and surgeries under anesthesia. Anesthetics play an important role in protecting patients from the stress of procedures and surgeries due to their sedative and analgesic effects. In addition, anesthetics can also cause unwanted side effects. The severity of these side effects can vary depending on many factors.